CREATE CONSTRAINT ON (Kalam:president) ASSERT Kalam.Name IS UNIQUE
输出
验证
使用：schema命令检查约束。
:schema
财产存在约束
属性存在约束用于确保具有特定标签的所有节点都具有特定属性。
注意：存在属性约束仅在Neo4j Enterprise Edition中可用。
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